Graminoid Removal Reduces the Increase in N2O Fluxes Due to Nitrogen Fertilization in a Boreal Peatland
Graminoid Removal Reduces the Increase in N2O Fluxes Due to Nitrogen Fertilization in a Boreal Peatland
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DOI：
10.1007/s10021-020-00516-5
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发表时间：
2020-05-29
期刊：
影响因子：
3.7
通讯作者：
Vogt, Judith
中科院分区：
文献类型：
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作者：
Le, Thuong Ba;Wu, Jianghua;Vogt, Judith
氮（N）沉降的增加可能会影响一氧化二氮（N2 O）的排放在北方泥炭地增加N的可用性和/或改变植被组成。然而，植被组成的变化（由于氮沉降的增加）对N2 O排放的影响仍然是未知的。因此，我们使用了析因设计，包括去除植物功能组和N施肥，以研究其独立的影响和N2 O通量的综合影响，在加拿大纽芬兰省西部的一个全营养毯沼泽。结果表明，施氮显著增加了土壤N2 O排放量。值得注意的是，N添加对N2 O通量的影响调制的禾本科植物的去除。特别是，去除禾本科植物减少69%的N2 O排放量增加，由于在实验的第三年的N施肥。这一结果表明，增强禾本科丰富，由于增加N沉积/施肥可能会显着增加N2 O的排放量在北方泥炭地导致更强的影响，在未来的全球气候和平流层臭氧消耗，如果没有采取措施，以减少活性N排放。
The increase in nitrogen (N) deposition may affect nitrous oxide (N2O) emission in boreal peatlands by increasing N availability and/or altering vegetation composition. However, the effects of changes in vegetation composition (due to the increase in N deposition) on N2O emission are still unknown. Therefore, we used a factorial design, comprising the removal of plant functional groups and N fertilization to investigate their independent effects and combined effects on N2O fluxes at an ombrotrophic blanket bog in Western Newfoundland, Canada. The results reveal that N2O emission significantly increased with N fertilization. Notably, the effect of N addition on N2O fluxes was modulated by the removal of graminoids. In particular, the removal of graminoids reduced 69% of the N2O emission increases due to N fertilization in the third year of the experiment. This result suggests that the enhancement of graminoid abundance due to increases in N deposition/fertilization may dramatically increase N2O emissions in boreal peatlands leading to stronger impacts on the global climate and stratospheric ozone depletion in the future if no countermeasures to reduce reactive N emission are undertaken.